| 摘要 |
An oil film bearing for a roll neck in a rolling mill, wherein a sleeve with a tapered bore is mounted on a tapered section of the roll neck for rotation therewith, the sleeve being journalled in a non-rotatable bushing contained in a bearing chock. During rolling, a film of high pressure oil is maintained hydrodynamically between the sleeve and bushing at the bearing load zone. In order to provide lubrication at the roll neck/ sleeve interface, a portion of the hydrodynamic oil is bled from the sleeve/bushing interface via holes extending radially through the sleeve into a plurality of longitudinal primary grooves in the sleeve bore. This conventional arrangement is improved by the addition of a plurality of secondary grooves in the sleeve bore. Oil is forced from the primary grooves into the secondary grooves via connecting grooves in the sleeve bore. The interconnected primary, secondary and connecting grooves form a plurality of discrete circumferentially isolated groove networks which are sequentially charged with high pressure oil as each rotates through the bearing load zone. The connecting grooves create a pressure differential which opposes reverse flow of oil from the secondary grooves into the primary grooves as a result of centrifugal force acting on the groove networks rotating through the unloaded zone of the bearing. |
